/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.vii.streamline.jsonrpc;

import com.vii.streamline.json.JsonRpcListener;
import com.vii.streamline.services.reflection.ReflectionReference;
import com.vii.streamline.services.reflection.ReflectionServices;
import com.vii.streamline.structures.collections.InnerList;
import com.vii.streamline.structures.collections.InnerMap;

import javax.servlet.ServletException;
import java.util.LinkedList;
import java.util.List;

/**
 * Specialised JsonRpcDispatcherServlet to execute all incoming call through reflection
 */
public class ReflectionJsonRpcServlet extends JsonRpcDispatcherServlet {

    protected static ReflectionJsonRpcServlet           servletInstanceJson;

    protected List<Class>                               services;
    protected List<Object>                              serviceSingletons;

    static{
        servletInstanceJson = new ReflectionJsonRpcServlet();
    }

    {
        services            = new InnerList<Class>();
        serviceSingletons   = new InnerList<Object>();
    }

    protected void collectServices( String... ss ){
        services = new InnerList<Class>();

        List<Class> classes = new LinkedList<Class>();

        for( String s : ss ){
            if( s == null ) continue;

            String[] classNames = s.split(";");
            for (String className : classNames) {
                try {
                    Class c = this.getClass().getClassLoader().loadClass(className);
                    classes.add( c );
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                }
            }
        }

        if( classes.size() > 0 )
            addServices( classes.toArray( new Class[classes.size()] ) );
    }

    @Override
    public void init() throws ServletException {
        super.init();

        getJsonRpcListener( );

        try{
            collectServices(
                getInitParameter("serviceClasses"),
                getServletContext().getInitParameter("serviceClasses"),
                System.getProperty("serviceClasses")
            );
        } catch( Exception e){
            e.printStackTrace();
        }
    }

    public void addServices( Class... services_ ){
        for( Class c : services_ )
            if( !services.contains( c ) )
                services.add( c );

        listener = null;
    }

    public void addServiceSingletons( Object... serviceSingletons_ ){
        for( Object o : serviceSingletons_ )
            if( !serviceSingletons.contains( o ) )
                serviceSingletons.add( o );

        listener = null;
    }

    public static ReflectionJsonRpcServlet getServletInstance() {
        return servletInstanceJson;
    }

    @Override
    protected JsonRpcListener getJsonRpcListener() throws ServletException {
        if( listener == null ){
            try{
                listener = new ReflectionJsonRpcListener(
                    ssoRequired, logger,
                    new InnerMap<String, ReflectionReference>(
                        ReflectionServices.getReferences( services.toArray( new Class[services.size()] ) ),
                        ReflectionServices.getReferences( serviceSingletons.toArray( new Object[serviceSingletons.size()] ) )
                    )
                );
            } catch(Exception e){ logger.error( e.getMessage(), e ); }
        }
        return listener;
    }

}
